In a mixing bowl, combine soy sauce, brown sugar, honey, rice vinegar, and sesame oil.

Add minced garlic, grated ginger, and red pepper flakes to the mixture.

Whisk the ingredients together until the sugar is dissolved.

Transfer the mixture to a saucepan and heat over medium heat until it begins to simmer.

Remove from heat and let cool slightly before using.

Garnish with chopped green onions before serving.